Niantic Terms of Service

We publish real-world augmented reality mobile experiences, including mobile game applications ("Apps"), and operate a real-world augmented reality platform ("Platform"). Please read these Niantic Terms of Service and any applicable App guidelines (the "Guidelines" and, collectively, "the Terms"), because the Terms govern your use of the Apps and Platform. The Terms also govern your interaction with any websites we own or operate ("Sites"), purchase of any Niantic merchandise, participation in Niantic live events or promotions ("Events"), and more generally your use of any Niantic products or services (together with Apps and Platform, the "Services").

For Ingress specific terms, that means the phone app, connections to Ingress servers intended for the phone app and the ingress.com website.

"Content" means the text, software, scripts, graphics, photos, sounds, music, videos, audiovisual combinations, communications, interactive features, works of authorship of any kind, and information or other materials that are generated, provided, or otherwise made available through the Services, including User Content.

This means content within the phone app, content received through connections to Ingress servers or website (see above for definition of "Services").

"User Content" means any Content a user of a Service provides to be made available through Services.

This means content that users generate or submit (things like portal photos and portal names).

Portals Images and Titles

Portals images and titles are submitted by users and fall under Ingress' "User Content".
Niantic does not claim ownership rights in User Content and nothing in these Terms restricts any rights...

This means portals images and titles aren't claimed under copyright by Niantic since it was end users who created them.

Things You Can't Do

attempt to access or search the Services or Content or download Content from the Services through the use of any technology or means other than those provided by Niantic or other generally available third party web browsers

Outgress is based on emails, which is a "technology or means" provided by Niantic. But it's a bit of a moot point because emails don't fall under the Terms of Service definition of "Content" or "Services".

extract, scrape, or index the Services or Content

Outgress does not do anything with the phone app, website or Ingress servers (see definition of "Services" and "Content"). Outgress is not a scraper and never makes any connection to Ingress servers in any way.

Your Emails

Niantic does not attempt to put terms on what you are allowed to do with your emails. You are free to search, compile, share, etc.

For Sake Of Argument...

Let's say emails were part of Ingress "Services" as defined by the Terms of Service (which they aren't), and also not a technology or means provided by Niantic (which they are). In that case, indexing emails would be a violation of the Terms of Service. This also means that any emails that you have in searchable form (for example in Gmail or any other email client) is also a violation of Ingress terms because they were indexed for search.

Has A User's Privacy Has Been Violated Because Other Users Can See Where They Played Ingress?

No, under the Niantic Privacy Policy, every Ingress user has agreed to allow Niantic to collect, store and transmit their location to other users. Users who are notified of other player locations are not required to keep that information private (they are free to let others know those locations).
When you use the Services, and in particular when you play our games, use social features within those games, or take part in live events, we will share certain Personal Data with other players. This Personal Data includes your in-game profile (such as your username, your avatar, and your team), your in-game actions and achievements, the real-world location of gameplay resources you interacted with when playing the games (for example PokéStops within Pokémon GO or Portals within Ingress)...

If you honestly don't want your location to be known, you absolutely should not be playing a location based game that sends push notifications, in-game alerts and emails to other players letting them know your location at a specific time.

Things Niantic Can Do

We may suspend or terminate your access to and use of the Services, at our sole discretion, at any time and without notice to you...

While we believe Outgress to be completely within the bounds of Ingress Terms of Service, Niantic is free to terminate your account at any time for any reason they want. So like most things in life, use Outgress at your own risk.